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Linking microstructure with acoustic properties of open-cell foams

Abstract : A research program has been initiated in January 2002 in order to link microstructure of high porosity open-celled foams with their acoustic properties. This paper is intended to highlight the main results of this study. The general objective of this work is the determination of the acoustical macro-behavior at the local scale of real rigid-framed porous media. In this purpose, one needs first to determine the local geometry of the media, and second to solve in it the partial differential equations which govern dissipation phenomena by thermal and viscous effects. The first step has been overcome by the modern technique of Computed Micro Tomography (CMT). This leads to experimental identification of the parameters of an idealized periodic unit-cell. The second step, the resolution of the linearized heat and viscous fluids equations under harmonic regime, is performed using Brownian motion simulations and finite element methods respectively, in three-dimensional and equivalent two dimensional unit-cells. Macroscopic behavior is obtained by spatial averaging of the local and frequency-dependant thermal and velocity fields. Results are presented in terms of only two frequency-dependant functions, taking into account the long-wavelength sound absorption and propagation properties of an air filled media; and compared with standing waves tube measurements. This computational methods combined with physically realistic cellular models will make optimal design of real open-celled foams a reality in the future.
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https://hal-upec-upem.archives-ouvertes.fr/hal-00812938
Contributor : Camille Perrot <>
Submitted on : Saturday, April 13, 2013 - 4:42:03 PM
Last modification on : Tuesday, November 19, 2019 - 12:21:54 PM

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  • HAL Id : hal-00812938, version 1

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Camille Perrot, R. Panneton, X. Olny. Linking microstructure with acoustic properties of open-cell foams. 4th Joint Meeting of the Acoustical Society of America and the Acoustical Society of Japan, Nov 2006, Honolulu, United States. pp.3145. ⟨hal-00812938⟩

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